PDK does not recognize common CI environments as non-interactive

It appears that Travis CI (and likely other common CI environments) are doing tricks with their runtime environments that make PDK's normal ability to distinguish between "interactive" and "non-interactive" environments unreliable.

The immediate impact is that PDK 1.11.0 is prompting for analytics consent when running in Travis instead of skipping the prompt and assuming opt-out as it was designed to do.

PDK should check for commonly set environment variables to try to more reliably detect CI environments and treat them as "non-interactive".